A180433 Binary string formed from the binary expansion of Pi by exchanging 0's and 1's.

0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0

Offset: 1

Author

Jonathan Vos Post, Sep 05 2010

Keywords

• base
• cons
• easy
• nonn

Comments

Binary complement of A004601.

May be converted to a decimal number in several ways, depending on where the binary point is inserted: .0011011011110... = 1-Pi/4, 0.011011011110... = 2-Pi/2 (see A180434), 00.11011011110... = 4-Pi.

Links

• Tarun Agarwal, Table of n, a(n) for n = 1..999

Crossrefs

Cf. A004601, A180434.

Programs

Mathematica

RealDigits[Pi,2,120][[1]]/.{1->0,0->1} (* Harvey P. Dale, Apr 02 2015 *)

Extensions

Verified and edited by N. J. A. Sloane, Sep 28 2010